[from the keycaps at the upper left] Pertaining to a standard
English-language typewriter keyboard (sometimes called the Sholes keyboard
after its inventor), as opposed to Dvorak or non-US-ASCII layouts or a
space-cadet keyboard or APL keyboard.

Historical note: The QWERTY layout is a fine example of a
fossil. It is sometimes said that it was designed
to slow down the typist, but this is wrong; it was designed to allow
faster typing — under a constraint now long
obsolete. In early typewriters, fast typing using nearby type-bars jammed
the mechanism. So Sholes fiddled the layout to separate the letters of
many common digraphs (he did a far from perfect job, though;
‘th’, ‘tr’, ‘ed’, and ‘er’,
for example, each use two nearby keys). Also, putting the letters of
‘typewriter’ on one line allowed it to be typed with particular
speed and accuracy for demos. The jamming problem
was essentially solved soon afterward by a suitable use of springs, but the
keyboard layout lives on.